101 Gadgets That Changed The World

The alarm clock. The personal computer. The smartphone. The radio. You know the greatest gadgets of all time (and you've probably owned most of them), but which has changed the world more than any other? To make our list of 101, a gadget had to be something you could hold in your hands, mechanical or electronic, and a mass-produced personal item. The rest was up to the judges. Check out our selections, and let us know in the comments what you think!

101. Duct Tape

101. Duct Tape

NASA astronauts have used it to make repairs on the moon and in space. The MythBusters built a boat and held a car together with the stuff. Brookhaven National Laboratory fixed their particle accelerator with it. And enthusiasts have used it to make prom dresses and wallets. You might say it's a material, not a gadget, but trust us: Duct tape is the ultimate multitool.

100. Fiberglass Fishing Rod

100. Fiberglass Fishing Rod

When hostilities in Asia curtailed bamboo imports, rod producers like Shakespeare, Phillipson, and Montague needed a new material to keep anglers equipped with low-cost, quality tackle in the '50s and '60s. Fiberglass fit the bill.